Temperature dependent EXAFS of InN

✍ Scribed by Katsikini, M. ;Pinakidou, F. ;Paloura, E. C. ;Komninou, Ph. ;Georgakilas, A. ;Welter, E.

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 264 KB
• Volume: 205
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200780140

✦ Synopsis

Abstract

The effect of temperature on the bonding environment of indium in an InN epilayer is studied using X‐ray absorption fine structure (EXAFS) spectroscopy. Shell‐by‐shell fitting of the EXAFS spectra reveals that, in the temperature range 80‐245 K, the change in the nearest neighbour distances is smaller than the uncertainty of the measurement. The Debye–Waller factor of the second neighbouring shell (In–In pair) shows strong temperature dependence. Fitting using the Einstein model yields an Einstein temperature equal to 193 K ± 5%. An alternative way of extracting information on the vibrational properties of the lattice is the simulation using the equation of motion method for the determination of the Debye–Waller factors. The used values of 120 N/m and 50 N/m of the force constants for In–N and In–In bond stretching, respectively, simulate satisfactory the spectra measured at five different temperatures in the range 80– 245 K. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)